[TowerTalk] 10M 4:1 "Transformer"

[Stan Stockton]

Larry,

I would suggest you consider an antenna that would look like a capital I or an H turned 90 degrees.  Feed it in the center of the vertical part and make the top and bottom horizontal portions the same.  I believe you can get close to 50 ohms with 50 inches vertical.

73…Stan, K5GO

> On May 21, 2022, at 9:02 PM, Larry Banks via TowerTalk <towertalk at contesting.com> wrote:
> 
> Hi All,
> 
> I am designing a rather unique 10m FM vertical for my local repeater net.  It has to fit into my attic, which is only 50" tall.  I have this antenna designed, and it "should" work, but it has an impedance of essentially 14 ohms.  (Typical for a shortened antenna.)  I want to fabricate a 4:1 transformer to facilitate this.  There are many such things available on the web, many of which I question. PLUS, I wish to design and build this myself.
> 
> I would appreciate any suggestions about how I should go about this.  Ferrite type and size, etc.  I have to admit that I have not yet done an exhaustive search of the already available sources, especially all of the great stuff from Jim, K9YC.  What I have already looked at is lots of ads for questionable stuff.
> 
> 73 -- Larry -- W1DYJ
> 
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